Variation and influencing mechanism of soil multifunctionality in grassland ecosystem
Grassland is a crucial part of terrestrial ecosystem and plays an important role in maintaining regional ecological security.Soil multifunctionality(SMF)is a comprehensive.index to measure the provided soil multi-ple functions,which has imperative significance for assessing grassland ecosystem function and regional sustain-able development.However,the current SMF studies are still in the initial stage,and the objects in studies are mostly farmland ecosystems,while there are relatively few studies on grassland and other natural ecosystems.In addition,there is few ecolgoists to elucidate the relationship among SMF of grassland ecosystems,plant and soil microorganisms,as well as the effect of global change on SMF in grassland ecosystems.Therefore,this paper discusses the study progress of SMF from five aspects:the concept of SMF,quantitative indicators and meth-ods,the relationship among plants and soil microorganisms and SMF,the impact of global changes on SMF and the spatial variability of SMF,and reviews the change and mechanisms of SMF in grassland ecosystems.Based on the existing problems in the existing studies,the following topics should be focused on:(1)Unified SMF quantitative methods;(2)The transformation mechanism of SMF at different spatial scales;(3)SMF driving mechanism of different grassland ecosystems;(4)Impacts of global changes such as precipitation increase,cli-mate warming and nitrogen deposition,and land use change on SMF;(5)The relationships and interactions be-tween above-ground ecological functions and SMF;(6)Effects of root functional traits on SMF and contribu-tions of plants to SMF at different scale levels;(7)The contribution of rare species of microorganisms and plant-soil animal-soil microbial multitrophic linkage on SMF.
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